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Going from 17.7.2 to 18.6 it would be 4,37 GB OTA on 12 Pro:

2025-07-29 19.22.jpg
 
iOS 17.6 beta - 17 June 2024
iOS 17.6 beta 2 - 01 July 2024
iOS 17.6 beta 3 - 09 July 2024
iOS 17.6 beta 4 - 16 July 2024
iOS 17.6 RC - 23 July 2024
iOS 17.6 - 29 July 2024

iOS 18.6 beta - 16 June 2025
iOS 18.6 beta 2 - 30 June 2025
iOS 18.6 beta 3 - 14 July 2025
iOS 18.6 RC - 21 July 2025
iOS 18.6 - 28 July 2025 [?]

iOS 17.6 RC [21G79]
iOS 17.6 [21G80]

iOS 18.6 RC [22G84]
iOS 18.6 [22G85/22G86] [?]

Releases
iOS 18.6 (22G86)
iPadOS 18.6 (22G86)
macOS 15.6 (24G84)
tvOS 18.6 (22M84)
visionOS 2.6 (22O785)
watchOS 11.6 (22U84)

Source

Just like last year, the non-beta release has a different build number compared to the RC [formerly known as GM]
 
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iOS 18.7 developer beta tomorrow and possibility of iOS 26 developer beta 5

Just checked and iOS 14.7 was the last x.7 release that went through several developer beta releases. iOS 15.7, iOS 16.7, and iOS 17.7 were all RC until the public non-beta was released.

Major focus will be on iOS 26 developer beta while minor focus will be on iOS 18.7 RC

Thanks for the correction @drak22
 
Last edited:
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iOS 18.7 developer beta tomorrow and possibility of iOS 26 developer beta 5
The iOS 18 beta cycle can be considered over, given what Apple has done in recent years. iOS 18.7 will be released alongside iOS 26, but it won't have a beta cycle. It will be for devices that don't support iOS 26, or if you don't want to install iOS 26.
 
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